Developer tools avoid unnecessary setup and keep common snippets, tokens, and test data in your browser where possible.
Chain small tools together: decode, inspect, format, compare, and generate types from the same data.
Luck predicts what you like
Calculate proportional image and video sizes from width and height.
Number base conversion tool
Convert text to uppercase, title case, camelCase, snake_case, and more.
Decode JWT tokens
Paste email HTML, extract images, and check alt text, width/height, and remote HTTP sources locally.
Paste a redirect map CSV to find multi-hop chains, loops, missing destinations, temporary redirects, and final URL mismatches before launch.
Convert PNG images to JPG locally with quality and background controls.
Paste response headers to parse max-age, immutable, and no-store, and flag stale-asset cache risk locally.
